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प्रश्न
Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.
Give reason for the following:
Lungs always contain a residual volume of air.
उत्तर
To maintain gas exchange efficiency. The lungs leftover air volume provides continuous oxygen to the blood, preventing alveolar collapse between breaths. This maintains oxygen levels and promotes gas diffusion.
संबंधित प्रश्न
Carbon dioxide enters into the leaves through tiny pores present on the surface of the leaf called _________.
(a) chlorophyll
(b) chloroplast
(c) stomata
(d) epidermis
If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.
Name the areas in a woody stem through which respiratory exchange of gases takes place.
Name an animal which depends on simple diffusion of gases for breathing.
Name the red pigment which carries oxygen in blood.
What is the other name of wind-pipe?
Describe the process of respiration in the following part of a plant:
Root
Why do fishes die when taken out of water?
Draw a labelled diagram of the human respiratory system.
How are oxygen and carbon dioxide exchanged in our body during respiration?
Which of the following is correct for the process of anaerobic respiration?
| Carbon dioxide always produced | A lot of energy released | |
| (a) | No | Yes |
| (b) | No | No |
| (c) | Yes | No |
| (d) | Yes | Yes |
An organism X having breathing organs A lives on land. When organism X goes underwater, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of the water, it dies after a short while. A third organism Z having breathing organs C and D which lives on the banks of ponds, lakes, and rivers can survive on land as well as in water equally well.
(a) What could organism X be? Name the breathing organs A.
(b) What could organism Y be? Name the breathing organs B.
(c) What could organism Z be? Name the breathing organs C and D.
(d) Out of X, Y, and Z, which organism is (i) amphibian, (ii) aquatic, and (iii)
terrestrial?
Out of xylem and phloem, which one carries materials upwards as well as downwards?
Answer this question.
What are the holes on the sides of the body of insects called?
Choose the odd one out in the following groups of four items each:
Hairy, Moist, Nostril, Vocal cord
Differentiate between the following pairs on the basis of the aspect given in the brackets.
Tidal volume and Residual volume (Quantity of air)
Give Suitable Explanation for the Following :
Why do you shiver and why do your teeth chatter when it is very cold in winter?
Rewrite the following statement by selecting the correct option.
During respiration, ____________ gas is given out.
Answer the following question.
In the experimental set up to show that "CO2 is given out during respiration", name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.
Draw a diagram of the human respiratory system and label - pharynx, trachea, lungs, diaphragm and alveolar sac on it.
